Inventors at Work: With Chapters on DiscoveryDoubleday, Page, 1906 - 503 páginas |
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alloy aluminium apparatus asbestos beam Bessemer blast blast furnaces boiler bridge building built carbon cent chemical coal coil compressed air concrete cooling copper curved cylinder diameter discovery double star drill economy effect electric employed energy experiment factory feet fire force fuel furnace gas engine gases girders glass hammer hand heat Holophane horse-power inches invar invention inventor James Watt lamp lathe length less light lines machine magnetic manganese manufacture mass material measurement mechanical metal method Michael Faraday milling machine motion motor needle observed ordinary pass pipe piston plant plate pounds pressure produced Professor properties radio-activity railroad rays reinforced concrete resistance rheostat sand selenium ship speed steam engine steam turbine stone strength substance success superheater surface telautograph temperature thorium tion to-day tube United valve vessel weight Welsbach mantle wheel wire wood York
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Página 356 - The philosopher should be a man willing to listen to every suggestion, but determined to judge for himself. He should not be biased by appearances; have no favorite hypothesis ; be of no school ; and in doctrine have no master. He should not be a respecter of persons, but of things. Truth should be his primary object. If to these qualities be added industry, he may indeed hope to walk within the veil of the temple of nature.
Página 348 - The thing that hath been is that which shall be ; and that which is done is that which shall be done ; and there is no new thing under the sun.
Página 205 - Accurate and minute measurement seems to the non-scientific imagination a less lofty and dignified work than looking for something new. But nearly all the grandest discoveries of science have been but the rewards of accurate measurement and patient long-continued labour in the minute sifting of numerical results.
Página 355 - In our conceptions and reasonings regarding the forces of nature, we perpetually make use of symbols which, when they possess a high representative value, we dignify with the name of theories. Thus prompted by certain analogies, we ascribe electrical phenomena to the action of a peculiar fluid, sometimes flowing, sometimes at rest. Such conceptions have their advantages and their disadvantages; they afford peaceful lodging to the intellect for a time, but they also circumscribe it, and by and by,...
Página 265 - I say again that, behind all our practical applications, there is a region of intellectual action to which practical men have rarely contributed, but from which they draw all their supplies. Cut them off from this region, and they become eventually helpless.
Página 253 - In filling up her nest she put her head down into it and bit away the loose earth from the sides, letting it fall to the bottom of the burrow, and then, after a quantity had accumulated, jammed it down with her head. Earth was then brought from the outside and pressed in, and then more was bitten from the sides. When, at last, the filling was level with the ground, she brought a quantity of fine grains of dirt to the spot, and picking up a small pebble in her mandibles, used as it a hammer in pounding...
Página 380 - ... he thought, that the planets were kept in their orbits by gravitating towards the sun. Kepler had discovered the great law of the planetary motions, that the squares of their periodic times were as the cubes of their distances from the sun...
Página 295 - ... health permitted, his young ardent mind was constantly occupied, not with one but many pursuits. Every new acquisition in science, languages, or general literature, seemed made without an effort. While under his father's roof, he went on with various chemical experiments, repeating them again and again until satisfied of their accuracy from his own observations. He had made for himself a small electrical machine, and sometimes startled his young friends by giving them sudden shocks from it.
Página 206 - Andrew's discovery of the continuity between the gaseous and liquid states was worked out by many years of laborious and minute measurement of phenomena scarcely sensible to the naked eye.
Página 356 - should be a man willing to listen to every suggestion, but determined to judge for himself. He should not be biased by appearances ; have no favourite hypothesis ; be of no school ; and in doctrine have no master. He should not be a respecter of persons, but of things. Truth should be his primary object. If to these qualities be added industry, he may indeed hope to walk within the veil of the temple of nature.